Surge tank



FIG. 1 is a top isometric view of a surge tank, showing an embodiment of our new design.

FIG. 2 is a bottom isometric view thereof.

FIG. 3 is a front elevational view thereof.

FIG. 4 is a rear elevational view thereof.

FIG. 5 is a left side elevational view thereof.

FIG. 6 is a right side elevational view thereof.

FIG. 7 is a top plan view thereof.

FIG. 8 is a bottom plan view thereof.

Stippling in the drawings represent the three-dimensional contours of the design, and is not intended to indicate surface decoration. The broken lines shown in the drawings depict portions of the surge tank that form no part of the claimed design. 

CLAIM The ornamental design for a surge tank as shown and described. 